On Wednesday, 19 January 2022 00:13:32 PST Lars Knoll wrote:
>> AVX is only used by a couple of classes in Qt Core and the drawhelper
>> in Qt Gui. Qt Gui already does runtime detection, so it would be only
>> about adding that to the methods in Qt Core.
Thiago Macieira (19 January 2022 17:48) replied:
> That's a misconception. AVX and especially AVX2 introduce a lot of
> codegen opportunities for the compilers, which they've been able to
> use for years.
Is the difference here:
* We have code that overtly conditions on the availability of CPU
features (for example in the places Lars mentioned) vs
* The compiler can achieve some optimizations, on which we currently
miss out, if we pass a relevant command-line option telling it to do
so (or omit one telling it not to) ?
(Hoping you'll educate me if I'm being dense.)
Eddy.
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